Application of analog and mixed signal simulation techniques to the synthesis and sequencing of diagnostic tests

This paper describes the fault definition, simulation, test strategy development and validation activities that were accomplished during beta testing of a new CAE tool, Test Designer. It addresses the issues of simulation convergence, component fault models, circuit model implementation, simulation run times and test strategy accuracy. To ensure a realistic test of Test Designer's capabilities, diagnostics were developed for a moderately complex analog and mixed signal UUT which was selected from the Navy's list of CASS TPS offload candidates. These diagnostics were evaluated on the CASS to measure the diagnostic sequence accuracy and to assess the ability of Test Designer to predict the nominal measurement values and fault detection characteristics of each test.